<template>
  <div>
    <!-- 面包屑  -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 头部警告区 -->
      <el-alert show-icon :closable="false" title="注意：只允许为第三级分类设置相关参数" type="warning">
      </el-alert>

      <!-- 选择商品分类区 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类区：</span>
          <!-- 选择商品分类的级联选择器 -->
          <el-cascader size="medium" expand-trigger='hover' v-model="selectedCayeKeys" :options="catelist" :props="cateProps" @change="handleChange"></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签区 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button @click="addDialogVisible=true" :disabled='isBtnDisabled' size="mini" type="primary">添加参数</el-button>
          <!-- 动态参数的表格 -->
          <el-table :data="manyRableDate" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <!-- 循环渲染tag标签 -->
              <template slot-scope="scope">
                <el-tag @close='handleClose(i,scope.row)' closable v-for="(item,i) in scope.row.attr_vals" :key="i">{{item}}</el-tag>
                <!--输入文本框  -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

              </template>
            </el-table-column>

            <!-- 索引列 -->
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button @click="showEditDialog(scope.row.attr_id)" size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                <el-button @click="removeDialog(scope.row.attr_id)" size="mini" type="danger" icon="el-icon-delete">删除</el-button>
              </template>
            </el-table-column>
          </el-table>

        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button @click="addDialogVisible=true" :disabled="isBtnDisabled" size="mini" type="primary">添加静态</el-button>
          <!-- 静态参数的表格 -->
          <el-table :data="onlyTableDate" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <!-- 循环渲染tag标签 -->
              <template slot-scope="scope">
                <el-tag @close='handleClose(i,scope.row)' closable v-for="(item,i) in scope.row.attr_vals" :key="i">{{item}}</el-tag>
                <!--输入文本框  -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button @click="showEditDialog(scope.row.attr_id)" size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                <el-button @click="removeDialog(scope.row.attr_id)" size="mini" type="danger" icon="el-icon-delete">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!--  添加动态参数和静态属性的对话框-->
    <el-dialog @close="addDialogClosed" :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%">
      <!-- 对话框里的表单 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!--  编辑动态参数和静态属性的对话框-->
    <el-dialog @close="editDialogClosed" :title="'编辑'+titleText" :visible.sync="editDialogVisible" width="50%">
      <!-- 对话框里的表单 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>

  </div>
</template>

<script>
export default {
  name: 'Params',
  components: {},
  data () {
    return {
      //存放联级选择器的数据
      catelist: [],
      //级联选择框得配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      //级联选择框双向绑定到得数组
      selectedCayeKeys: [],
      //被激活页签的名称
      activeName: 'many',
      //动态参数的数据
      manyRableDate: [],
      //静态参数的数据
      onlyTableDate: [],
      //控制对话框的显示与隐藏
      addDialogVisible: false,
      //添加参数的表单数据对象
      addForm: {},
      //添加表单验证规则的对象
      addFormRules: {
        attr_name: [{
          required: true, message: '请输入参数的名称', trigger: 'blur'
        },
        ]
      },
      //控制对话框的显示与隐藏
      editDialogVisible: false,
      //编辑参数的表单数据对象
      editForm: {},
      //编辑表单验证规则的对象
      editFormRules: {
        attr_name: [{
          required: true, message: '请输入参数的名称', trigger: 'blur'
        },
        ]
      },




    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品列表失败')
      }
      this.catelist = res.data

    },
    //级联选择框中 项变化就会触发
    handleChange () {
      this.getParamsDate()
    },
    //tab页签点击事件触发的函数
    handleTabClick () {

      this.getParamsDate()
    },
    //获取参数的数据
    async getParamsDate () {
      if (this.selectedCayeKeys.length !== 3) {
        this.selectedCayeKeys = []
        this.onlyTableDate = []
        this.manyRableDate = []
        return
      }
      //根据所选分类的id和当前所处的面板获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []//以空格作为分割符，转换成数组

        //控制文本框显示与隐藏
        item.inputVisible = false
        //文本框中输入的值
        item.inputValue = ''

      });


      if (this.activeName === 'many') {
        this.manyRableDate = res.data
        console.log(this.manyRableDate);
      } else {
        this.onlyTableDate = res.data
        console.log(this.onlyTableDate);

      }

    },
    //监听添加对话框的关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    //点击按钮进行 添加表单里的数据
    addParams () {
      this.$refs.addFormRef.validate(async vaild => {
        if (!vaild) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName,
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败')
        }
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsDate()
      })
    },
    //点击编辑按钮弹出对话框
    async showEditDialog (attr_id) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status != 200) {
        return this.$message.error('获取参数信息失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true

    },
    //监听编辑对话框的关闭事件
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    //编辑表单确定按钮
    editParams () {
      this.$refs.editFormRef.validate(async vaild => {
        if (!vaild) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName,
        })
        if (res.meta.status !== 200) {
          return this.$message.error('编辑参数失败')
        }
        this.$message.success('编辑参数成功')
        this.getParamsDate()
        this.editDialogVisible = false
      })
    },
    //点击删除对话框的数据
    async removeDialog (attr_id) {
      const confirRustle = await this.$confirm('此操作将永久删除该文件, 是否继续?', '删除分类', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if (confirRustle !== 'confirm') {
        return this.$message.info('已取消删除操作!')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('分类删除失败!')
      }
      this.$message.success('该分类已经成功删除!')
      this.getParamsDate()
    },
    //文本框失去焦点或者按下Enter都会触发
    async handleInputConfirm (row) {//trim（）是去除字符串两边的空格
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      //如果没有return，证明输入的内容合法，需要做继续的处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = '',
        row.inputVisible = false
      //发起请求
      this.saveAttrVals(row)
    },
    //对attr_vals的操作
    async saveAttrVals (row) {
      //发起请求
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数项成功')
    },
    //点击按钮 显示文本框
    showInput (row) {
      row.inputVisible = true
      //让文本框自动获得焦点
      //nextTick方法的作用，就是当页面上的元素被重新渲染之后，才会指定 回调函数中的代码
      //第一个refs获取的是el-input这个元素，第二个refs是从el-input元素中获取原生的DOM节点
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    //删除对应的参数可选项
    handleClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)

    }
  },
  computed: {
    //如果按钮需要被禁用就返回true，否则false
    isBtnDisabled () {
      if (this.selectedCayeKeys.length !== 3) {
        return true
      }
      return false
    },
    //这是当前选中的三级分类的id
    cateId () {
      if (this.selectedCayeKeys.length === 3) {
        return this.selectedCayeKeys[2]
      }
      return null
    },
    //用来判断对话框左上角title文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'

    }
  }
}

</script>
<style lang='less' scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>